#include "blaswrap.h"
/*  -- translated by f2c (version 19990503).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include "f2c.h"

/* Common Block Declarations */

struct {
    integer selopt, seldim;
    logical selval[20];
    doublereal selwr[20], selwi[20];
} sslct_;

#define sslct_1 sslct_

logical dslect_(doublereal *zr, doublereal *zi)
{
    /* System generated locals */
    integer i__1;
    doublereal d__1, d__2;
    logical ret_val;

    /* Local variables */
    static doublereal rmin;
    static integer i__;
    static doublereal x;
    extern doublereal dlapy2_(doublereal *, doublereal *);


/*  -- LAPACK test routine (version 3.0) --   
       Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,   
       Courant Institute, Argonne National Lab, and Rice University   
       February 29, 1992   


    Purpose   
    =======   

    DSLECT returns .TRUE. if the eigenvalue ZR+sqrt(-1)*ZI is to be   
    selected, and otherwise it returns .FALSE.   
    It is used by DCHK41 to test if DGEES succesfully sorts eigenvalues,   
    and by DCHK43 to test if DGEESX succesfully sorts eigenvalues.   

    The common block /SSLCT/ controls how eigenvalues are selected.   
    If SELOPT = 0, then DSLECT return .TRUE. when ZR is less than zero,   
    and .FALSE. otherwise.   
    If SELOPT is at least 1, DSLECT returns SELVAL(SELOPT) and adds 1   
    to SELOPT, cycling back to 1 at SELMAX.   

    Arguments   
    =========   

    ZR      (input) DOUBLE PRECISION   
            The real part of a complex eigenvalue ZR + i*ZI.   

    ZI      (input) DOUBLE PRECISION   
            The imaginary part of a complex eigenvalue ZR + i*ZI.   

    ===================================================================== */


    if (sslct_1.selopt == 0) {
	ret_val = *zr < 0.;
    } else {
	rmin = 0.;
	i__1 = sslct_1.seldim;
	for (i__ = 1; i__ <= i__1; ++i__) {
	    d__1 = *zr - sslct_1.selwr[i__ - 1];
	    d__2 = *zi - sslct_1.selwi[i__ - 1];
	    x = dlapy2_(&d__1, &d__2);
	    if (x <= rmin) {
		rmin = x;
		ret_val = sslct_1.selval[i__ - 1];
	    }
/* L10: */
	}
    }
    return ret_val;

/*     End of DSLECT */

} /* dslect_ */


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